Database and Articles Indices
- AGRICOLA
- Database of the National Library of Agriculture
- Biodiversity Heritage Library
- Digitized legacy literature of biodiversity
- BioOne available through Drexel University Library
- Research journals in the biological, ecological, and environmental sciences
- Directory of Open Access Journals
- Open Access index to scientific and scholarly journals
- Entrez
- Search engine for NCBI (National Center for Biotechnology Information) databases
- GPO Federal Digital System (FDsys)
- Free online access to U.S. Government Publications
- JSTOR: Global Plants (Academy connection required)
- Over two million high-resolution plant type specimens and related materials
- IUCN Red List of Threatened Species
- Assessments of over 70,000 species and with each species account showing background documentation
- The National Academies Press
- Reports published by the National Academies Press available as free downloads for personal use
- OpenDOAR
- Directory of academic open access repositories
- OpenThesis
- Repository of theses and dissertations
- Pensoft Publishers Journal Archive
- Open Access journals from Pensoft Publishers
- Pubmed
- U. S. National Library of Medicine database containing biomedical literature from MEDLINE, life science journals, and online books
- Royal Society Journal Archive
- Royal Society Journal Archive offering free access to articles more that 70 years old
- TL-2, Vol. 1 and TL-2, Suppl I
- Taxonomic Literature, 2nd ed., of the International Association for Plant Taxonomy, available through the Biodiversity Heritage Library
- TOXNET
- Toxic substances information, maintained by the National Library of Medicine
- USGS Water-Data Reports
- Annual water-data reports from each state
- WorldCat
- Books and other materials in libraries worldwide
- Zoological Record, 1864-present (Academy connection required)
- Worldwide coverage of Zoological literature